View the shutter, aperture, and ISO settings you use most often instantly

Template Browsers in the Slideshow, Print, and Web module are now hierarchical

By default, slide shows will only include the selected photos (if there is more than one photo selected)

Various clarity and sharpening improvements

As I said, that's just a small portion of the very long list of improvements that version 1.1 offers. What's more, John Gruber said the process of upgrading from version 1.0 was "...super simple." What more could you want?